Scientific Treatises (1640-1658)[GBWW,GI,HTR,HC]Includes the following works: Account of the Great Experiment Concerning the Equilibrium of Fluids,
New Experiments Concerning the Vacuum, Treatise on the Arithmetical Triangle, Treatises on the Equilibrium of Liquids and on the Weight of the Mass of the Air,
On Geometrical Demonstration, and Preface to the Treatise on the Vacuum.
The latter two works are also part of the Minor Works.

No known online collections; see Minor Works for On Geometrical Demonstration and Preface to the Treatise on the Vacuum.

Available at Amazon.Com:

Used Hardcover edition of The Provincial Letters, Pensees, Scientific Treatises (Great Books of the Western World 33), copies available at last check (Encyclopaedia Britannica, 1952, 487 pg).